Engine Code P0141

Well, I have been having a problem with my O2 sensors. I changed it and then all of the codes came off.. well while i was driving the code P 0141 came on.. took my car to the dodge dealer and they said that its meaning O2 Sensor heater cirtuit malfuinction bank 1 sensor 2. that was the one that i replaced, so they gave me a new one. so i changed it again and the code was wiped. so then i was driving and the code came back on.. there is no way that its the new O2 sensor again. When the car is scanned the code automadicly comes back again to.. could someone please help me with this cuz i really dont want to get in to deep with money to fix it becasue these cars are not cheap to fix. Someone had mentioned to me that it could be wiring but were is the wiring problem, and how could i fix it my slef!!!
Please HELP!!
Amanda